CN101221395B - Developing unit and image forming apparatus using the same - Google Patents
Developing unit and image forming apparatus using the same Download PDFInfo
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- CN101221395B CN101221395B CN2008100030285A CN200810003028A CN101221395B CN 101221395 B CN101221395 B CN 101221395B CN 2008100030285 A CN2008100030285 A CN 2008100030285A CN 200810003028 A CN200810003028 A CN 200810003028A CN 101221395 B CN101221395 B CN 101221395B
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
- G03G21/20—Humidity or temperature control also ozone evacuation; Internal apparatus environment control
- G03G21/206—Conducting air through the machine, e.g. for cooling, filtering, removing gases like ozone
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G2221/00—Processes not provided for by group G03G2215/00, e.g. cleaning or residual charge elimination
- G03G2221/16—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements and complete machine concepts
- G03G2221/1645—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements and complete machine concepts for conducting air through the machine, e.g. cooling
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Abstract
A developing unit for developing an electrostatic latent image formed on the outer peripheral surface of a latent image bearing member rotating in one direction with a developer by mixing electrostatically chargeable toner and magnetic carrier, includes: a developing roller; a carrier collecting roller; a cooling portion including a forced draft duct for airflow from a fan and disposed on the bottom side of the developing vessel; a suctioning portion including a suctioning duct for airflow from suctioning ports disposed on the lower side of the carrier collecting roller, disposed under the forced draft duct; a filter for removing the scattering toner from air including the scattering toner suctioned from the suctioning ports; and, an exhaust portion including an airflow exhaust duct for discharging the air passed through the filter and the forced draft duct to an exhaust port.
Description
Technical field
The present invention relates to a kind of developing cell that in the imaging device that adopts electrofax, uses and the imaging device that comprises this developing cell such as duplicating machine, printer, facsimile recorder etc.The invention particularly relates to a kind of developing cell, this developing cell comprises the cooling body of developing trough and adopts the aspirating mechanism of managing the toner that aspirates the distribution around distinguishing of developing.
Background technology
Along with duplicating machine, facsimile recorder, printer and Multi Role Aircraft latest developments with these functions at a high speed, high-resolution structure, reducing as the carrier of the basic fundamental of electrophotographic method and the size of toner.Yet, because the size of carrier and toner is less, so during developing, in the development district that is positioned at this imaging device, carrier granular is transferred on the latent image carrier easily, promptly on the photosensitive drums, also scatter toner easily, thereby cause image degradation and have defective.In addition, the increase of processing speed causes the temperature in the developing cell to raise, thereby change the developer characteristic and reduce picture quality, therefore, when particularly under high temperature and high humidity environment, using this machine, to produce following problem, promptly developer takes place to solidify and complete closed developing cell itself in developing cell.
In order to address the aforementioned drawbacks, patent documentation 1 (Japanese Patent Application Publication HeiNo.10-274883) discloses a kind of developing cell, and this developing cell comprises: developing trough, and it is used to keep developer; Magnetic roller, it is arranged in this developing trough, is used for developer feeding to photosensitive drums; And suction fan, its pump orifice is arranged in the two ends of magnetic roller, with the developer that scatters from magnetic roller by the pump orifice suction.This developing cell can utilize small-sized aspirator to aspirate the developer of distribution effectively, but also can reduce the diameter of photosensitive drums.
Another patent documentation 2 (Japanese Patent Application Publication 2006-23413) discloses a kind of imaging device, and this imaging device comprises a kind of developing cell, and this developing cell has cooling tube and scatters the overall hierarchical structure of toner suction tube.That is to say, in this imaging device, cooling tube is arranged on by developing cell and is used for recording chart is transported in the space that the paper feed path of transfer printing unit limits, with interior with the cooling developing cell by cold air being sent into pipe, and this cooling tube is formed with and paper feed path opening opposing, cold air is blowed to the recording chart by this paper feed path.In addition, the distribution toner suction tube that is used to aspirate the toner of distribution be formed on cooling tube below.Utilize this imaging device, can prevent from this equipment, to raise, and not hinder the size that reduces this equipment and reduce number of components owing to its hot fixing causes temperature.
Patent documentation 3 (Japanese Patent Application Publication 2004-361869) discloses another kind of imaging device, and this imaging device comprises: the developer forwarder, and it makes the developer Electrostatic Absorption on the electrostatic latent image that is formed on the image-carrier; Shell, it has the space that is used for receiving photographic developer forwarder and developer, and is formed with and the image-carrier open parallel; Suction tube, it is used to aspirate the toner and the paper end of the suspension in this shell; And cooling tube, it is used to cool off this developing cell, wherein utilizes common aspirator from suction tube and cooling tube suction air.In this imaging device, can prevent that temperature from raising, and the toner that can reduce in the developing cell scatters.
In patent documentation 1 disclosed developing cell, be provided with suction path, its be used for below magnetic (development) roller with and the toner that scatters of two ends suction, and discharge air by being positioned at central filter.Yet, do not mention carrier collection member.In addition, this aspirator aspirates carrier and toner indissociably, therefore, can not avoid the loss of carrier and filtrator to stop up.In addition, do not mention comprising any cooling device therefore, do not know whether can realize cooling effect yet.
In the imaging device of patent documentation 2, aspirator and cooling device are divided into two-layer the structure.Yet, do not mention the carrier gathering-device, therefore, aspirator can not aspirate carrier and toner separated from one anotherly.Therefore, the minimizing of the carrier in the developer and aspirate toner together and carrier will cause carrier to stop up this filtrator.In addition, owing to this cooling device is configured to air is sent into the paper feed path, but this cooling device is not arranged to cool off the whole bottom of developing cell, so the enough cooling effects of not talkative acquisition.
In addition, in the imaging device of patent documentation 3, because aspirator and cooling device layered arrangement, the whole bottom of cooling off this developing cell but this cooling device is not configured to is so the cooling of developing trough is effective inadequately.In addition, do not mention the carrier gathering-device yet, therefore, can not aspirate carrier and toner separated from one anotherly.That is to say that this structure does not reach can the resolved vector minimizing, the level of the problem of plugged filter etc.
In a word, disclosed developing cell of above-mentioned patent documentation and imaging device are not able to also prevent that toner from scattering and enough levels of cooling off developing trough effectively and suppressing the temperature rising of developing trough.In addition, owing to aspirate carrier and toner indissociably, so up to the present, above-mentioned all structure all can not resolved vector reduces and the problem of plugged filter.
Summary of the invention
The problems referred to above in view of traditional developing cell existence, designed the present invention, therefore, the purpose of this invention is to provide a kind of new improved developing cell and imaging device, it can prevent that toner from scattering and the temperature of developing trough raises, and can aspirate toner and carrier discretely with this developer.
In order to address the above problem, a kind of developing cell is proposed, this developing cell is used to utilize charged developer that the electrostatic latent image on the outer surface that is formed on the sub-image bearing carrier that rotates with a direction is developed, by mixing two kinds of components, but the toner and the magnetic carrier that perhaps mix static electrification prepare this charged developer, this developing cell comprises: developer roll, this developer roll are used for this developer is sent to this sub-image bearing carrier; The carrier collecting drum, this carrier collecting drum is arranged in the downstream of this developer roll with respect to the sense of rotation of this sub-image bearing carrier; Cooling segment, this cooling segment comprise the forced draft pipe that is used for from the air-flow of fan, and are arranged in the bottom side of this developing trough; Pumping unit, this pumping unit comprises the suction tube that is used for from the air-flow of pump orifice, and be arranged in this forced draft pipe below, the downside that this pump orifice is arranged in this carrier collecting drum is used to aspirate the toner of the distribution in this developing cell; Filtrator, this filtrator are used for removing from air the toner of this distribution, and this air comprises from the toner of the distribution of this pump orifice suction; And discharge section, this discharge section comprises the air-flow vent pipe, is used for air by this filtrator and the air by this forced draft pipe are discharged to escape hole.
Utilize this structure, be pumped near the toner that scatters as the photosensitive drums of sub-image bearing carrier and the developer roll development district adjacent to each other, can collect the toner of the distribution that fully separates with carrier by downside from this carrier collecting drum.Therefore, can prevent that filtrator from stopping up, and can prevent that carrier from reducing, plugged filter and carrier may take place when aspirating toner with carrier granular reduce.In addition, from this pipe the developing trough bottom is applied air, can obtain the cooling effect of this developing cell by the forced draft pipe.
Except above-mentioned structure, in this cooling segment, as the forced draft inlet of the import of this forced draft pipe can be arranged in respect to this developer roll axial one distolateral on, as the forced draft outlet of the outlet of forced draft pipe can be arranged in another distolateral on, the forced draft pipe can form so that cover the whole surface of the bottom of developing trough substantially.
Utilize above-mentioned layout, owing to can arrange the bottom that cooling segment and pumping unit integrally cool off this developing cell separately by dividing two-layer ground, so can strengthen the cooling effect of this developing cell significantly.
Except above-mentioned structure, this pump orifice can be arranged on the downside at two ends of this carrier collecting drum.
Utilize above-mentioned structure, suction is optionally carried out at the two ends of the carrier collecting drum that can scatter at the easiest generation toner, therefore can prevent any suction load that increases this pumping unit lavishly.
Except above-mentioned structure, following structure can also be provided, promptly make prime at filtrator, comprise from the air-flow of the toner of the distribution of pump orifice suction and be converted into one air-flow, and being conducted through filtrator, filtrator has the structure that can insert pumping unit and can remove from pumping unit.
Utilize above-mentioned structure, because this suction tube forms from two ends towards the center suction air, thereby the toner that suction is more successfully scattered is accumulated in the suction tube so this structure can prevent toner etc., and makes filtrator be easy to safeguard.
Except above-mentioned structure, this extraction tube and this forced draft pipe can be connected to single current path, and this fan can only be arranged in a position in this single current path.
Utilize this structure, at escape hole single fan is set and makes this fan be used for cooling and suction simultaneously.
Except above-mentioned structure, the turn fractions of this suction tube, this cooling tube and this vent pipe can be formed with radiused corners portion.
Utilize above-mentioned structure, can make the air-flow of each pipe in path steady, so that reinforced suction, cooling and discharge effect more significantly.
Except above-mentioned structure, the bottom of this developing trough can be formed by aluminium.
Because this structure has strengthened cooling effect, so can prevent that because the curing of the developer in the developing cell and variation, the variation of picture quality and the fault of developing cell of the developer characteristic that causes, the variation of developing cell environment temperature will cause the curing of developer.
Except above-mentioned structure, can in this developing trough, be provided for regulating the pressure adjusting filtrator of the pressure in this developing trough.
Because this filtrator was as reliever, so this structure can suppress the distribution of toner when the pressure in developing cell raise.
In order to address the above problem, the present invention relates to comprise the imaging device of above-mentioned developing cell.
Utilize above-mentioned structure, even the carrier and the developer that adopt diameter to be reduced, also can be suppressed at the distribution that toner takes place during the development around the development district of imaging device, therefore, can be reduced in the deterioration of printing off quality that is formed on the image on the recording chart etc. in the imaging device.In addition, owing to obtaining to overcome because enough cooling effects that the temperature of the developing cell that high speed operation causes raises, so can prevent the variation of the developer characteristic that causes because of the variation of the environment temperature of developing cell, the variation and the other problems of picture quality.
As mentioned above, according to the present invention,, can realize sufficient cooling by utilizing split tunnel to aspirate the toner that scatters and cooling off developing trough.In addition, owing to aspirate the toner of the distribution of imaging device from the downside that is positioned at carrier collecting drum two ends, so can only carrier and toner fully separated back suction toner-particle, former carrier is inadequate with separating of toner.Therefore, can prevent that filtrator from take place stopping up and carrier reduces, plugged filter and carrier reduce will work as when aspirating toner under comprising the situation of carrier and take place.
Description of drawings
Fig. 1 illustrates the synoptic diagram of employing according to the total structure of the imaging device of the developing cell of first embodiment of the invention;
Fig. 2 is the part detail drawing of structure of equipment body that the imaging device of this embodiment is shown;
Fig. 3 illustrates the developing cell in the imaging device that is arranged in this embodiment and the side view of the schematic configuration of toner conveyance device;
Fig. 4 is the cut-open view of structure that the developing cell of this embodiment is shown;
Fig. 5 A is the sectional view of structure that the mixing mill of the developing cell that constitutes this embodiment is shown;
Fig. 5 B is the cut-open view of cutting open along the face B1-B1 ' among Fig. 5 A;
Fig. 5 C is the cut-open view of cutting open along the face B2-B2 ' among Fig. 5 A;
Fig. 5 D is the cut-open view of cutting open along the face B3-B3 ' among Fig. 5 A;
Fig. 5 E is the cut-open view of cutting open along the face B4-B4 ' among Fig. 5 A;
Fig. 6 is the skeleton view that is illustrated in the structure of the outer wall 260b that limits suction tube 250 in the base structure of developing cell of this embodiment;
Fig. 7 is the planimetric map that is shown schematically in the base structure of the developing cell of this embodiment when the top is watched;
Fig. 8 illustrates the various forms that impose a condition that the developing cell that utilizes this embodiment carries out aging test;
Fig. 9 compares when not utilizing cooling segment to carry out air cooling in order to utilize cooling segment to carry out air cooling the time, and the chart that the temperature of developing trough in the aging test raises is shown; And
Figure 10 illustrates the developing cell of this embodiment of the present invention and the form of the comparative result between traditional developing cell.
Embodiment
The preferred embodiments of the present invention are described below with reference to the accompanying drawings.In this instructions and accompanying drawing, utilize identical Reference numeral presentation function and the substantially the same parts of structure, so that it is not repeated in this description.
The explanation employing is according to the structure of first embodiment of the imaging device of developing cell of the present invention at first, with reference to the accompanying drawings.Fig. 1 illustrates the synoptic diagram of employing according to the total structure of first embodiment of the imaging device of developing cell of the present invention.Fig. 2 is the part detail drawing of structure that the equipment body of this imaging device is shown.
As illustrated in fig. 1 and 2, be the imaging device of following type according to the imaging device 1A of present embodiment, this imaging device is by forming electrostatic latent image on the cylindrical photosensitive drums (sub-image bearing carrier) 3 of rotating drive; Utilize by mixing two kinds of components, it is visual developer image that toner that can static electrification and magnetic carrier and the charged developer for preparing make latent electrostatic image developing; And this developed image is transferred on the predetermined recording paper as recording medium (below be called paper), according to electrofax, handle the view data of catching or the view data of transmission, and do not export black and white (monochrome) image by scanner etc.This imaging device 1A adopts the developing apparatus that is used for the electrostatic latent image on the visual photosensitive drums 3 as developing cell 2 conducts of feature of the present invention, and this developing cell 2 comprises the carrier collecting drum 220 (Fig. 2) that is used to collect the magnetic carrier that sticks on the photosensitive drums 3 and is used for removing from carrier collecting drum 220 carrier scavenge unit (carrier remover) 230 (Fig. 2) of the magnetic carrier of being collected by carrier collecting drum 220.
This imaging device 1A comprises: sheet feed tray 8, can pile up plurality of sheets of paper thereon and open P (Fig. 1); Paper translator unit 59, its paper P that is used for carrying from this sheet feed tray 8 is sent to imaging moiety 14; And sheet transport system 7, it is used for paper P is sent to fixation unit 6, and imaging moiety 14 is printed the toner image of not photographic fixing on this paper P, in fixation unit 6, make the toner fusion of not photographic fixing and photographic fixing on this paper.According to corresponding to multiple predetermined transfer rate of printing off the paper P of tupe, imaging device can be selected and the transfer rate of control paper P according to print request, and automatically paper P is sent to paper discharge tray 9 from sheet feed tray 8.
At first, will the total structure of imaging device 1A be described.As shown in Figure 1, imaging device 1A mainly comprises: equipment body 1A1, and it comprises: exposing unit 1, developing cell 2, toner conveyance device 30, photosensitive drums 3, charger 4, charge erasure device 41, cleaning unit 5, fixation unit 6, sheet transport system 7, paper feed path 7a, sheet feed tray 8, paper discharge tray 9, transfer device 10 etc.; And automatic document handler 1A2.
Be provided with the original paper mounting table of being made by clear glass 21 at the top of equipment body 1A1, document is placed on this original paper mounting table 21.Automatic document handler 1A2 is arranged in the top of this original paper mounting table 21, pivotally opens so that it can make progress, and is arranged in below this original paper mounting table 21 as the sweep test 22 of the document reader of the image information that is used to read original paper.
Exposing unit 1, developing cell 2, photosensitive drums 3, charger 4, charge erasure device 41, cleaning unit 5, fixation unit 6, sheet transport system 7, paper feed path 7a, paper discharge tray 9 and transfer device 10 are arranged in below the sweep test 22.In addition, the sheet feed tray 8 that holds paper P therein is arranged in below these devices.
Exposing unit 1 has following function, promptly give off laser beam according to view data from unshowned presentation manager output, be recharged the surface of the photosensitive drums 3 of device 4 uniform charging with irradiation, thereby will write on corresponding to the electrostatic latent image of this view data and be formed on the surface of photosensitive drums 3.This exposing unit 1 directly is arranged in below the sweep test 22, and on photosensitive drums 3, and comprising laser scan unit (LSU) 13a and 13b, this laser scan unit 13a and 13b comprise generating laser 11 and catoptron 12.In the present embodiment, in order to realize the flying print operation, a plurality of laser beam of utilizing a plurality of generating lasers 11 to send are with the irradiation frequency (reducing the processing load of each laser beam in the unit interval) that reduces each laser beam.More particularly, employing utilizes a pair of generating laser 11 to send the two-beam technology of two laser beam.At this, in the present embodiment, laser scan unit (LSU) 13a and 13b are used for exposing unit 1, but also can adopt the light-emitting device array of EL (electroluminescence) for example or LED (light emitting diode) write head.
Arrange this paper disengaging pawl 31 so that utilize solenoid 32 to make it removable for contacting and the outer surface that does not contact photosensitive drums 3.At this paper disengaging pawl 31 during in abutting connection with the outer surface of photosensitive drums 3, this paper disengaging pawl 31 is used to peel off during with the unfixed toner image transfer printing system paper P on the photosensitive drums 3 and sticks to photosensitive drums 3 lip-deep paper P.At this, as the driver of paper disengaging pawl 31, can utilize replacement solenoids 32 such as drive motor, perhaps also can select other driver.
Developing cell 2 utilizes the visual electrostatic latent image that is formed on the photosensitive drums 3 of the toner of black, and this developing cell 2 is positioned at roughly the same level with photosensitive drums 3 one sides (right side of figure) that sense of rotation (direction of the arrow A among this figure) with respect to photosensitive drums is arranged in charger 4 downstreams.Alignment roller 15 arranges that this developing cell 2 is on the upstream side with respect to recording medium transporting direction below this developing cell 2.To describe this developing cell 2 below in detail.
In the middle of will being kept at by the toner that the toner container 300 that is filled with toner is discharged temporarily, toner conveyance device 30 in the accumulator 33, then this toner is fed to developing cell 2.This toner conveyance device is arranged adjacent to developing cell 2.Be arranged on below this toner conveyance device 30 is piping unit 50, this piping unit 50 comprises unshowned blower fan, be used for air is delivered to the developing trough 200 of developing cell 2, to force cooling or to get rid of the operation heat that when developing cell 2 is operated, produces.To describe pipeline unit 50 in detail below.
Unshowned drive unit and controller function are also controlled alignment roller 15, being sent between photosensitive drums 3 and the transfer belt 103 from the paper P that sheet feed tray 8 is carried, the leading end of paper P and the toner image on the photosensitive drums 3 are aligned.
As mentioned above, when 10 pairs of these paper of transfer device apply the opposite polarity electric field of electric charge of its polarity and electrostatic image, the visual electrostatic image on the photosensitive drums 3 is transferred on the paper P that is transmitting.For example, when electrostatic image had negative (-) electric charge, the polarity that transfer device 10 is applied should be just (+).
In addition, charge erasure roller 106 is used to wipe the electric field that when transmitting paper P by transfer area paper P is applied, so that this paper successfully is sent to next stage, this charge erasure roller 106 is arranged on the inboard with respect to the transfer belt 103 on the downstream of the transfer area that is positioned at transfer belt 103 of paper conveyance direction.
As shown in Figure 2, transfer device 10 also comprises: cleaning unit 107, and it is used to remove because toner remains in the dirt that produces on the transfer belt 103; And a plurality of charge erasure devices 108, it is used to wipe on the transfer belt 103.By through equipment ground, perhaps, utilize erasing apparatus 108 to wipe electric charge by initiatively applying the opposite polarity electric charge of polarity and transfer printing field.
To have the paper P that is transferred to the electrostatic image (the not toner of photographic fixing) on it by transfer device 10 and be sent to fixation unit 6, and, this paper be pressurizeed and heats at developing cell 6, with fusion not photographic fixing toner and with its photographic fixing on paper P.This fixation unit 6 comprises: warm-up mill 6a and backer roll 6b, as shown in Figure 2, and be transferred to toner image on the paper P with fusion and photographic fixing by rotation warm-up mill 6a, so that transmit the paper P that remains between warm-up mill 6a and the backer roll 6b by roll gap therebetween.The transfer roller 16 that is used to transmit paper P is arranged in the downstream with respect to the fixation unit 6 of defeated paper direction.In addition, be used for that paper P is discharged to exit roller 17 on the paper discharge tray 9 and be arranged in downstream with respect to this transfer roller 16 of defeated paper direction.
Warm-up mill 6a has: paper disengaging pawl 611; Thermistor 612 is as the roll surface temperature detecting device; And roll surface cleaning member 613, they all are arranged in the periphery of warm-up mill 6a, and this warm-up mill 6a also comprises and be positioned at its inner heating source 614, are used for the surface of warm-up mill is heated to predetermined temperature (fixing temperature of setting: about 160 to 200 ℃).
On this fixation unit 6, as shown in Figure 2, crimping point between warm-up mill 6a and backer roll 6b (being called photographic fixing cramping part) 600, warm-up mill 6a makes the toner heating and the fusion of the not photographic fixing on the paper P that is just carrying, so that be used to from the pressure of warm-up mill 6a and backer roll 6b paper P be produced the grappling effect, thereby the toner fixing that makes not photographic fixing is on paper P.
As shown in Figure 1, sheet feed tray 8 piles up multiple paper (paper), image information will be exported (printing) to this paper, and sheet feed tray 8 is arranged in below the imaging moiety 14, and imaging moiety 14 is made of exposing unit 1, developing cell 2, photosensitive drums 3, charger 4, charge erasure device 41, cleaning unit 5, fixation unit 6 etc.Paper pick-up roller 8a is arranged in the top of the paper discharging side of this sheet feed tray 8.
This paper pick-up roller 8a picks up paper P one by one from the top that is stored in the stacker in the sheet feed tray 8, and (for convenience's sake with this principal direction downstream, the supply side (carton side) of paper P is called the upstream, and paper discharging side is called the downstream) be transported to alignment roller (also being called as " dummy roll ") 15 sides on the paper feed path 7a.
Because the imaging device 1A according to present embodiment is intended to carry out the flying print operation, is arranged in below the imaging moiety 14 so can all pile up a plurality of sheet feed trays 8 of 500 to 1500 standard size paper P.In addition, the high capacity sheet feed tray 81 that can store the paper of multiple large volume is arranged in a side of this equipment, simultaneously, supports basically the manual sheet feed tray 82 that irregular size paper prints etc. is arranged on the high capacity sheet feed tray 81.
Row's paper disc 9 across this equipment layout on manual sheet feed tray 82 opposite sides.The system that can also be constructed as follows alternatively arranges the postprocessor of the output paper that being used to bind, bore a hole etc. and/or multi-chamber row paper disc etc., to replace row's paper disc 9.
Sheet transfer system 7 is between above-mentioned photosensitive drums 3 and sheet feed tray 8, and will be transported to transfer device 10 one by one for paper P from sheet feed tray 8 by the paper feed path 7a that is included in the sheet transfer system 7, in transfer device 10, toner image is transferred on this paper from photosensitive drums 3, and this paper is transported to fixation unit 6, in fixation unit 6, the toner image of photographic fixing is not on this paper, then according to row's paper tupe of appointment, lead at paper feed path and branch road under the guiding of paper spare and carry this paper.
On imaging device 1A, two kinds of predetermined output tupe, i.e. single face printing model and duplex printing patterns have been prepared according to present embodiment.Under the single face printing model, there are two kinds of paper discharging methods, promptly the printing surface of discharging the face up paper discharging method and the paper of paper up with the printing surface of paper is discharged the paper discharging method that faces down of paper down.
Then, with developing cell 2 and the peripheral components thereof of explanation formation with reference to the accompanying drawings according to the imaging device 1A of present embodiment.Fig. 3 illustrates the schematic side elevation that is included in according to the structure of developing cell in the imaging device of present embodiment and toner feed device.
In this embodiment, as shown in Figure 3, toner conveyance device 30 is arranged adjacent to developing cell 2.Have blower fan etc., be used for the piping unit 50 that air is sent into the developing trough 200 of the appearance that forms developing cell 2 is arranged on below this toner conveyance device 30, so that force to get rid of the operation heat that 2 operating periods of developing cell produce.
As shown in Figure 3, in developing cell 2,, form toner input port 201 being used to supply the position that abuts to form the developing trough 200 of its appearance from the opening 30a of the toner of toner conveyance device 30.This developing trough 200 comprises: developer roll 202, blade roller 203, mixing mill 204, transfer roller 205, dividing plate 206 and regulating part 207.Relatively contact the mode of the outer surface of photosensitive drums 3 with the outer surface (developer sticks on the outer regions) of developer roll 202, developing cell 2 is installed in the imaging device 1A.That is, relatively contact the outer surface formation developing location of the developer roll 202 of photosensitive drums 3.In addition, with arranged beneath carrier scavenge unit 230 is arranged near the developer roll 202 in the opening that is expressed as 200a of developing trough 200, this carrier scavenge unit 230 comprises the carrier collecting drum 220 that is used to collect the carrier that sticks on the photosensitive drums 3.
In developing trough 200, transfer roller 205 will be transported to mixing mill 204 by toner conveyance device 30 toners that carry and that import by toner input port 201, and at mixing mill 204 places, toner mixes with magnetic carrier, thus the preparation two-component developing agent.Mixing mill 204 mixes the two-component developing agent of above-mentioned new formation with the residue developer that returns by aforementioned barriers 206.The developer that mixing by mixing mill 204 obtains is electrification by friction when being stirred by blade roller 203, is supplied to the developer roll 202 of this electrostatic latent image that is used to develop then, further is transported to the electrostatic image that is formed on the photosensitive drums 3 then.
A distolateral friction member 202 that is formed on dividing plate 206 in combination at first rubs and precharge to the developer that is fed to developer roll 202, simultaneously developer is adjusted to conveying capacity (bed thickness).Then, regulating part 207 is the bed thickness of the developer that transmitted by developer roll 202 of control further, and this regulating part is by supporting member 212 supportings as the part of developing trough 200.Like this, regulate the supply of developer, and dividing plate 206 makes the residue developer of eliminating return along the direction of leaving regulating part 207, dividing plate 206 is as the circulation plates that the residue developer is returned.Regulating part 207, friction member 211 and dividing plate 206 form the same long with developer roll 20.
In addition, form a plurality of correction plates 208, and arrangement utilizing transmits the bulkhead sides forwarder 209 that screw rod 210 transmits the residue developers on the downside of dividing plate 206 at the upside of dividing plate 206.Below detailed description is arranged on these parts in the developing cell 2.
The toner of accumulator 33 in the middle of stirrer 34 stirs at first within it and delivers to like this.Stirrer 34 is made of shaft 34a and stirring piece 34b mounted thereto.When shaft 34a rotated, stirring piece 34b was around shaft 34a rotation, thus the toner that is positioned at middle accumulator 33 that stirring is carried from toner container 300.
The toner that is stirred like this by stirrer 34 is carried in the stirring action of stirrer 34, and then, this toner is transported to transfer roller 36 sides by transfer roller 35.Transfer roller 36 will be transported to opening 30a from the toner that stirrer 34 transmits by transfer roller 35, thereby toner is fed to developing cell 2, and accumulator 33 was in abutting connection with the position of developer roll 2 in the middle of this opening 30a was formed on.
The valve that is used to open and close toner feed port 300a is opened the bottom side (being positioned at downside when toner container 300 is installed on the imaging device 1A) that is arranged on the supporting structure 350 of toner container 300 with closing organ 400, as shown in Figure 3, discharge from supporting structure 350 by this toner feed port 300a for toner from toner container 300.Specifically, open when discharging the toner feed port 300a of supporting structures 350 at valve with closing organ 400, toner feed port 300a realizes being communicated with the opening 33a that is provided with for middle accumulator 33, so that will be from the toner supply of toner container 300 discharges to middle accumulator 33.
Then, with the latent structure that describes in detail with reference to the accompanying drawings according to the developing cell 2 of present embodiment.Fig. 4 is the cut-open view that illustrates according to the structure of the developing cell of present embodiment; Fig. 5 A is the sectional view that the structure of the mixing mill that constitutes this developing cell is shown; Fig. 5 B is the cut-open view along the intercepting of the face B1-B1 ' among Fig. 5 A; Fig. 5 C is the cut-open view along the intercepting of the face B2-B2 ' among Fig. 5 A; Fig. 5 D is the cut-open view along the intercepting of the face B3-B3 ' among Fig. 5 A; And Fig. 5 E is the cut-open view along the intercepting of the face B4-B4 ' among Fig. 5 A.
As shown in Figure 4, developing cell 2 comprises the developing trough 200 that forms its appearance, and the toner input port 201 that is used for guiding toner is formed on this developing trough 200 in abutting connection with the position of developing trough 200 being provided with for toner feeding means 30 with the opening 30a (Fig. 3) that carries toner.This developing trough 200 is storage of developer therein, and comprises developer roll 202, blade roller 203, mixing mill 204, transfer roller 205, regulating part 207 and collecting drum 220.
In developing trough 200, toner that transfer roller 205 will be carried from toner feeding means 30 (Fig. 3) and that import by toner input port 201 is transported to mixing mill 204, toner mixes with magnetic carrier in mixing mill 204, thus the preparation two-component developing agent.Mixing mill 204 mixes the two-component developing agent of above-mentioned new formation with existing developer in the developing trough 200.When blade roller 203 stirs this developer, by utilizing mixing mill 204 to mix the developer electrification by friction of acquisition, be supplied to then and be used for developer roll 202 that electrostatic latent image is developed, and developer roll 202 is sent to this developer the electrostatic latent image that is formed on the photosensitive drums 3.Utilization is by the regulating part as supporting member 212 supportings of the part of developing trough 200, and the bed thickness of the developer that is fed to developer roll 202 and therefore transmits is controlled.Like this, the amount of the toner that will be fed to photosensitive drums 3 is regulated.
Measure as the temperature rising in the reply developing cell 2, in order to utilize piping unit 50 more effectively to carry out air blast cooling, developing trough 200 is made of the metal material with high thermal conductivity such as aluminium etc., and has the opening 200a (Fig. 3) in the face of the outer surface of (relatively) photosensitive drums 3.
The step-down mechanism (pressure adjusting filtrator) 217 that is used to reduce the pressure in the developing trough 200 is arranged on the Outboard Sections on top of the supporting member 212 at the top that forms developing trough 200.This step-down mechanism 217 periodically operates, and with the pressure in the reduction developing cell 2, thereby can prevent the toner sputter that this equipment is interior.At this, the installation site of step-down mechanism 217 is not limited to the top of developing trough 200.For example, this mechanism can be arranged in the side or the bottom of developing trough 200, as long as it can reduce the pressure in the developing trough 200.
The toner concentration sensor 213 that is used to detect the toner concentration in the developing trough 200 is arranged on the bottom, and is relative with the downside of mixing mill 204 in the developing trough 200.Imaging device 1A is configured to so that when the toning dosage that is mixed by mixing mill 204 and stir is lower than right quantity, according to the measured value of toner concentration sensor 213, from toner input port 201 supplying toners.
In the opening 200a of developing trough 200, adjacent with developer roll 202 and below developer roll 202, be provided for collecting the carrier collecting drum 220 of the magnetic carrier that is transferred on the photosensitive drums 3.More particularly, carrier collecting drum 220 is arranged in the downstream position with respect to the developer roll 202 of the sense of rotation of photosensitive drums 3, and is positioned to and the photosensitive drums 3 less gap of about 1mm at interval.In addition, the carrier scavenge unit 230 of removing the magnetic carrier of being collected by this carrier collecting drum 220 from carrier collecting drum 220 is arranged in respect to the position on the downstream of the sense of rotation of carrier collecting drum 220.
In the present embodiment, shown in Fig. 4 and 6, be used for below the bottom that is expressed as 200b that forced draft pipe 240 from the air-flow of the blower fan of piping unit 50 is arranged in developing trough 200, as the cooling segment that is used to force to cool off the operation heat that produces in 2 operating periods of developing cell.The following formation suction tube 250 of this forced draft pipe 240, be used to make air-flow to arrive suction fan 53 (Fig. 6), as the toner that is used to aspirate near the distribution in the development district of developing cell 2 from the pump orifice 252 of two ends that are arranged in carrier collecting drum 220 and downside.
Although in the present embodiment, forced draft pipe 240 and suction tube 250 combine formation with the base structure 260 of the developing trough 200 of supporting developing cell 2, but forced draft pipe 240 and suction tube 250 also can form separately, as long as forced draft pipe 240 and suction tube 250 are formed in the sided configuration, wherein forced draft pipe 240 is formed on the upper layer side near the bottom 200b of developing trough 200, and suction tube 250 is formed on the lower layer side that is positioned at below the forced draft pipe 240.Detailed construction with forced draft pipe 240 and suction tube 250 integrally formed base structure 260 will be described below.
As shown in Figure 4, developer roll 202 is arranged as with photosensitive drums 3 and leaves developing gap (about 0.5 to 1.5mm).Developer roll 202 is made of magnetic roller 214 with a plurality of magnetic poles and non magnetic sleeve 215, and this non magnetic sleeve 215 is formed with substantial cylindrical by aluminium alloy, brass etc., and is arranged in magnetic roller 214 tops with respect to magnetic roller 214 rotations.In this magnetic roller 214, to arranging a plurality of bar magnets, be specially magnetic pole elements N1, N2, N3 and N4 and the magnetic pole elements S1 that the S pole field is provided, S2 and S3 that the N pole field is provided with square-section with order shown in Figure 4 leading thread disconnected from each other.
Utilize the sidewall of developing trough 200, magnetic roller 214 is non-rotatably supported and is fixed on the two ends of magnetic roller 214.Magnetic pole elements N1 is arranged in the position relative with the outer surface of photosensitive drums 3.Every dot-and-dash line representing with P1, P2, P3 and the P4 of magnetic pole elements N1, N2, N3 and N4 is represented with respect to the width center of the relevant magnetic pole elements of the circumferencial direction of developer roll 202 or the central axis of relevant magnetic pole.Central axis P1, P2, P3 and the P4 of these magnetic poles radially extends from the central axis 02 of developer roll, and is formed on the whole length of magnetic element (on the length of sleeve 215).Orientate as with the magnetic pole elements N1 of the outer surface of photosensitive drums 3 and to make the central axis P1 of this magnetic pole overlap with the straight line (plane) of the central axis of central axis (outside the scope of Fig. 4) by photosensitive drums 3 and developer roll 202 basically.
On the sense of rotation of developer roll 202, with the above-mentioned magnetic pole elements of being disposed in order of N1, S3, N4, N3, S2, N2 and S1.The magnetic field that is produced by magnetic pole elements N1, the N2 of such layout, N3, N4, S1, S2 and S3 will be adsorbed onto by the two-component developing agent particle that toner and carrier constitute on the outer surface of turnbarrel 215, to form the scopiform tip (being called magnetic brush) of extending along the circumferencial direction of this sleeve.When photosensitive drums is rotated, in above-mentioned developing gap zone, be formed on the surface of the magnetic brush friction photosensitive drums 3 on the developer roll 202 of rotation, thereby realize developing.
Regulating part 207 is controlled at the quantity of the developer that transmits between itself and the developer roll 202, simultaneously developer is electrified, and regulating part 207 is made of the nonmagnetic metal plate that has near the square-section.One end of regulating part 207 is relative with the outer surface of developer roll 202 (sleeve 215), has predetermined gap simultaneously betwixt.Regulating part 207 is fixed on the cladding element 216, and is arranged in the opening 200a (Fig. 3).This regulating part 207 is made of the nonmagnetic metal plate such as aluminium, stainless steel etc.
Shown in Fig. 5 A, mixing mill 204 stirs and also transmits the toner of being supplied with by toner conveyance device 30 (Fig. 3), and this mixing mill 204 comprises: turning axle 204a, its basically with developer roll 202 be arranged in parallel (Fig. 4); With a plurality of tabular agitating element 204b (204b1 to 204b4) that separate.
Agitating element 204b is arranged as that miter angle approximately tilts with respect to the bearing of trend of the axis of turning axle 204a (be called axially).Agitating element 204b comprises: agitating element 204b3, its be arranged in turning axle 204a with respect to axial approximate center; Be arranged in the group 204B1 of the agitating element 204b1 on accompanying drawing right side and a plurality of agitating element 204b2 and be arranged in the agitating element 204b4 in accompanying drawing left side and the group 204B2 of a plurality of agitating element 204b2.At this, with respect to turning axle 204a axially, agitating element 204b1 and 204b4 are arranged in two ends.
In the present embodiment, group 204B1 is identical with the quantity of organizing the agitating element 204b2 that 204B2 comprises.That is, mixing mill 204 has odd number agitating element 204b.
Shown in Fig. 5 B and 5E, the agitating element 204b1 and the 204b4 that are arranged in the two ends of turning axle 204a have the point-symmetric approximate half-circular with respect to rotation 204a.At length, by cutting ellipse into two along the line that is substantially perpendicular to longitudinal axis L 1, agitating element 204b1 and 204b4 have half elliptic, and this oval-shaped longitudinal axis L 1 is by rotation 204a.
A plurality of agitating element 204b2 are arranged between agitating element 204b3 and the agitating element 204b1 and between agitating element 204b3 and agitating element 204b4, and all with respect to the axioversion of turning axle 204a and have roughly oval shape, shown in Fig. 5 C.This structure can make each agitating element produce stronger conveying capacity along the direction of rotation.
The agitating element 204b3 that is disposed generally on the center of turning axle 204a has roughly oval shape, this elliptical shape has notch portion 204c in the position relative with above-mentioned toner concentration sensor 213, shown in Fig. 5 D, thereby allow to pass through from the light that is used to detect of toner concentration sensor 213.Another notch portion 204c be formed on this agitating element with respect to the center of rotation 204a and the point-symmetric position, position of above-mentioned otch.That is, pair of notches part 204c is formed on respect to mutual point-symmetric position, the center of rotation 204a.Therefore, this structure of agitating element 204b3 can prevent that toner concentration sensor 213 from output pulsations taking place, this fluctuation be since when the agitating element 204b of mixing mill 204 rotation the volume density of developer will change.
As shown in Figure 4, blade roller 203 is arranged between developer roll 202 and the mixing mill 204, and blade roller 203 stirs the developer that the mixing by mixing mill 204 prepares, and makes this developer charged, thus with this developer feeding to developer roll 202.
As mentioned above, the carrier collecting drum 220 that is used to collect the magnetic carrier that sticks on the photosensitive drums 3 be arranged in developer roll 202 below, with adjacency photosensitive drums 3.With respect to the sense of rotation of carrier collecting drum 220, be arranged in the position in downstream by the carrier scavenge unit 230 of the magnetic carrier of these carrier collecting drum 220 collections from 220 removings of carrier collecting drum.
Then, will describe in detail with reference to the accompanying drawings as foundation structure 260 according to the characteristic of the developing cell 2 of present embodiment.Fig. 6 is the skeleton view that is illustrated in the structure of the outer wall 260b that limits suction tube 250 in the foundation structure of developing cell of present embodiment.Fig. 7 be schematically illustrated when the top is watched the planimetric map of the foundation structure of the developing cell of this embodiment.
In order to limit forced draft pipe 240 and suction tube 250, foundation structure 260 comprises next door 260a and outer wall 260b, as shown in Figure 4.
First side of next door 260a is relative with the bottom 200b of developing trough 200, and second side is relative with outer wall 260b.
This foundation structure 260 (Fig. 6) is connected to piping unit 50.
Piping unit 50 comprises: blower fan 51 is used for blow air with cooling developing trough 200; Suction fan 53 is as the suction source of the toner that is used to aspirate distribution; And vent pipe 54, being used in the future, the air of self forcing ventilation duct 240 and suction tube 250 is directed to escape hole 55.
As shown in Figure 7, forced draft pipe 240 has: forced draft inlet 240a, as inlet from the air of blower fan 51; And forced draft outlet 240b, as outlet.
Forced draft inlet 240a and forced draft outlet 240b are formed near the two ends (it can be formed on each two distolateral end) with respect to vertical (axially) of developer roll 202, simultaneously apart from one another by preset distance (width of the pump orifice 253 of combination in this embodiment).Yet its layout should not be confined to this.
([) or U-shaped form forced draft pipe 240, but its layout should not be confined to this with square bracket shape from forced draft inlet 240a to forced draft outlet 240b.
The opening at the opening at forced draft inlet 240a place and forced draft outlet 240b place is with identical direction orientation, but its layout should not be confined to this.These two openings can be with different direction orientations.
In a word, as long as it can cooling sole 200b, this forced draft pipe 240 can adopt structure arbitrarily.
In the present embodiment, for the entire portion of the bottom 200b that can cool off developing cell 2, forced draft pipe 240 is configured to so that cover the whole surface of the bottom 200b of developing trough 200 substantially, as shown in Figure 7.Yet its layout should not be confined to this.
Air by forced draft pipe 240 is sent from forced draft outlet 240b, discharges from escape hole 55 then, thereby by forced draft vent pipe 54b and public vent pipe 54.
On the other hand, suction tube 250 has two pump orifices 252, and it is used to aspirate the toner of distribution, and at the upstream side with respect to airflow direction; With a combination pump orifice 253, it is positioned at the downstream, thereby forms the path of approximate Y shape.Yet the shape of pump orifice 250 is not limited to this approximate Y shape.
Be arranged near the two ends of carrier collecting drum 200 as two pump orifices 252 of the inlet of the toner that is used to scatter, wherein for example only scatter toner easily at two lower ends of carrier collecting drum.Therefore, can reduce the suction load of suction fan 53, and can realize effective suction.
Can determine the length ratio of the non-opening portion between the A/F of the pump orifice 252 on vertical (axially) of carrier collecting drum 220 and two pump orifices 252 and 252 according to experiment, to maximize aforesaid operations efficient.
Although the opening of pump orifice 252 is orientated as towards photosensitive drums 3, its layout should not be confined to this.That is, for example, can the orientating as of this opening towards carrier collecting drum 220, the peristome between photosensitive drums 3 and carrier collecting drum 220 grades, so that can collect the toner of distribution effectively.
Assembled from the air-flow of the toner that contains distribution of two pump orifices, 252 suctions at the two ends that are arranged on carrier collecting drum 220, so that this combined airflow is by removing the filtrator 52 of the toner that scatters from the air of the toner that contains distribution, suction fan 53 is from combination pump orifice 253 these combined airflow of suction then.
With respect to vertical (axially) of developer roll 202, export formation combination pump orifice 253 between the 240b at forced draft inlet 240a and forced draft, and the opening of combination pump orifice 253 is to export the identical direction orientation of 240b with forced draft inlet 240a and forced draft.
By suction vent pipe 254 and public vent pipe 54, discharge by the air of filtrator 52 with combination pump orifice 253 from escape hole 55.
Adopt aforesaid way, formation comprises the two ends that are arranged in carrier collecting drum 220 and a pair of pump orifice 252 and suction tube that is formed on the combination pump orifice 253 of suction fan 53 upstreams of downside, can successfully aspirate the toner of distribution, and not at the suction tube 250 inner toners etc. of accumulating.
For the ease of safeguarding that filtrator 52 is suitable for and can removes from top insertion filter-holder 52a and from filter-holder 52a, filter-holder 52a is formed on the position near the suction fan 53 of foundation structure 260.In addition, in the present embodiment, for by making the air-flow in the every pipe steadily realize more effective suction, cool off and discharge, airflow direction all corner parts in this suction tube that turns to 250, cooling tube 240 and vent pipe 54 are formed with curved surface (circular surface), as shown in Figure 7.
As mentioned above, in the present embodiment, be positioned at the toner of the distribution around photosensitive drums 3 and the developer roll 202 development district adjacent to each other from the suction of the downside of carrier collecting drum 220, so that can collect the toner of the distribution that fully separates with carrier.Therefore, can prevent that filtrator from taking place to stop up and carrier reduces, and this will take place when aspirating toner with carrier granular.In addition, owing to cross on the whole surface of bottom 200b that forced draft pipe 240 roughly is applied to developing trough 200, so produce significant cooling effect on this developing trough 200 that is arranged in developing cell 2 from the air communication of blower fan 51.
Although in above-mentioned first embodiment, forced draft pipe 240 and suction tube 250 are configured with the passage of two separate, so that be connected respectively to blower fan 51 and suction fan 53, but forced draft pipe 240 and suction tube 250 can connect into single air flue, only in certain position single fan are set in this air flue.For example, this structure can make single fan shared by cooling and suction by fan is arranged in escape hole.
(aging test)
Then, compare, the effect that obtains from the developing cell structure according to first embodiment of the invention is described by developing cell and traditional developing cell with first embodiment of the invention.Fig. 8 is the various forms that impose a condition that illustrate in the aging test.Fig. 9 illustrates the chart that the temperature of developing trough in the aging test raises, thereby compares when not carrying out air cooling when the cooling segment that utilizes first embodiment carried out air cooling, raises and the relation of whether cooling off from environment temperature to specify temperature.Figure 10 is the form that the comparative result of the developing cell of first embodiment of the invention and the aging test between traditional developing cell is shown.This form is illustrated in and has printed off 500k (500 * 10
3) after the aging operation of opening, the reduction of carrier, the weight recruitment of the filtrator (total amount that weight increases; Whenever print off 100k (100 * 10
3) open and just to change filtrator) and in 500k Zhang Laoization operating period because developer solidifies the operating troubles number of times that causes.At this, traditional developing cell does not have and the identical cooling body of cooling segment that is the developing cell setting of first embodiment of the invention, and does not have the carrier collecting drum.In addition, with the mode identical according to the developing cell of first embodiment of the invention, traditional developing cell is configured to so that aspirate from the bottom at the two ends of developer roll.
In aging test, developing cell 2 is designed to satisfy condition shown in Figure 8, and makes this developing cell 2 operations.As mentioned above, be constructed so that according to the developing cell 2 of first embodiment of the invention forced draft pipe 240 as cooling segment is arranged in the top as the suction tube 250 of pumping unit, thereby with the entire portion of the bottom 200b of blows air over developing trough 200.Therefore, as shown in Figure 9, do not utilizing cooling segment to carry out under the situation of air cooling, then the temperature that raises from ambient air temperature is 24.1 degree.On the contrary, when adopting cooling segment, the temperature that raises from ambient air temperature is 15.5 degree.That is, because comprise the pressure cooling effect of the cooling segment of suction tube 250 of the present invention and blower fan 51, so temperature is reduced by 8.6 degree (=24.1 degree-15.5 degree).That is, can be reduced to from the temperature that ambient air temperature raises and be equal to or less than 18 degree, this is the desired value that temperature raises, the result that under this temperature, can obtain to wish, and can not produce operating troubles and other problems about developing cell.Therefore, can prevent that developing cell 2 from making developer in this developing cell solidify and can not operate owing to the temperature of developing cell 2 raises, the temperature of developing cell 2 raises and is caused by high speed operation.
In addition, in developing cell 2 of the present invention, the place, two ends on the downside of carrier collecting drum 220 forms the pump orifice 252 as the inlet of suction tube 250.Cross suction tube 25 from the air communication of the toner that contains distribution of these pump orifices 252 suctions, and be collected in the combination pump orifice 253 by filtrator 52, this filter arrangement is in the center of the side of the developing trough 200 relative with the side with developer roll 202.Utilize suction fan 53, suction vent pipe 54a and public vent pipe 54, further the air-flow of this spline filter is inhaled to escape hole 55.Therefore, in developing cell of the present invention, aspirate by downside from carrier collecting drum 220, can collect the toner of the distribution that fully separates with this carrier, therefore, compare, can prevent from filtrator etc., to stop up with traditional developing cell, and can prevent that carrier from reducing, as shown in figure 10.
In addition, owing to optionally initiatively aspirate at the two ends of the carrier collecting drum 220 that scatters from the easiest generation toner, thus can realize suction, and do not increase the waste that suction is loaded.In addition, because suction tube 250 forms air is taken out from two ends to the center therefore to realize suction smoothly, so toner accumulation etc. can not take place in suction tube 250.Therefore, can reduce the number of times that causes these developing cell 2 generation operating troubless because of the developer that in this developing cell, occurs solidifying etc., as shown in figure 10.
Promptly, because in developing cell 2 of the present invention, by carrier and toner being separated fully and can being aspirated toner, so can not collect toner under the situation of capturing carrier at filtrator 52, reduce the weight weightening finish of filtrator, perhaps more particularly, prevent that the amount vector in the developer from reducing.In addition, owing to, cool off the developing trough 200 of developing cell 2 by the bottom 200b of overall cooling developing cell 2, so hardly operating troubles can take place by the cooling channel that separates with suction path is set.
Although the preferred embodiments of the present invention have been described with reference to the drawings, certainly, the present invention should not be confined to above-mentioned example, and obviously, within the scope of the claims, those skilled in the art can carry out various changes and modification.Therefore, should think that various distortion are interpreted as in technical scope of the present invention.
For example, although in above-mentioned first embodiment, the present invention is applied to be installed in the developing cell on the forming monochrome image equipment that comprises single toner container, but, also the aspirating mechanism that adopts the toner of the cooling body of developing trough of pipe of developing cell of the present invention and distribution can be applied to comprise the developing cell that is used for colour print of a plurality of toner containers.
Claims (8)
1. developing cell, this developing cell is used to utilize charged developer that the electrostatic latent image on the outer surface that is formed on the sub-image bearing carrier that rotates with a direction is developed, prepare this charged developer by in developing trough, mixing two kinds of components, but toner and magnetic carrier that these two kinds of components are static electrification, this developing cell comprises:
Developer roll, this developer roll are used for described developer is sent to described sub-image bearing carrier;
The carrier collecting drum, this carrier collecting drum is arranged in the downstream of described developer roll with respect to the sense of rotation of described sub-image bearing carrier;
Cooling segment, this cooling segment comprise the forced draft pipe that is used to guide from the air-flow of fan, and are arranged in the bottom side of described developing trough;
Pumping unit, this pumping unit comprise the suction tube that is used to guide from the air-flow of pump orifice, and be arranged in described forced draft pipe below, the downside that this pump orifice is arranged in described carrier collecting drum is used to aspirate the toner of the distribution in the described developing cell;
Filtrator, this filtrator are used for removing from air the toner of described distribution, and this air comprises from the toner of the distribution of described pump orifice suction; And
Discharge section, this discharge section comprises the air-flow vent pipe, is used for air by described filtrator and the air by described forced draft pipe are discharged to escape hole,
Wherein, in described cooling segment, as the forced draft inlet of the import of described forced draft pipe be arranged in respect to described developer roll axial one distolateral on, as the forced draft outlet of the outlet of described forced draft pipe be arranged in another distolateral on, described forced draft is tubular to be become so that cover the whole surface of the bottom of described developing trough substantially.
2. developing cell according to claim 1, wherein, described pump orifice is arranged on the downside at two ends of described carrier collecting drum.
3. developing cell according to claim 1, wherein, prime at described filtrator, comprise from the air-flow of the toner of the distribution of described pump orifice suction and be converted into one air-flow, and being conducted through described filtrator, described filtrator has the structure that can insert described pumping unit and can remove from described pumping unit.
4. developing cell according to claim 1, wherein, described suction tube and described forced draft pipe are connected to single current path, and described fan only is arranged in a position in the described single current path.
5. developing cell according to claim 1, wherein, the turn fractions of described suction tube, described cooling tube and described vent pipe is formed with radiused corners portion.
6. developing cell according to claim 1, wherein, the bottom of described developing trough is formed by aluminium.
7. developing cell according to claim 1 wherein, is provided for regulating the pressure adjusting filtrator of the pressure in the described developing trough in described developing trough.
8. imaging device that comprises developing cell according to claim 1.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007-003954 | 2007-01-12 | ||
| JP2007003954 | 2007-01-12 | ||
| JP2007003954A JP4226039B2 (en) | 2007-01-12 | 2007-01-12 | Developing device and image forming apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101221395A CN101221395A (en) | 2008-07-16 |
| CN101221395B true CN101221395B (en) | 2010-06-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008100030285A Expired - Fee Related CN101221395B (en) | 2007-01-12 | 2008-01-10 | Developing unit and image forming apparatus using the same |
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| Country | Link |
|---|---|
| US (1) | US7587154B2 (en) |
| JP (1) | JP4226039B2 (en) |
| CN (1) | CN101221395B (en) |
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| US8078079B2 (en) * | 2007-12-18 | 2011-12-13 | Lexmark International, Inc. | Air duct and toner cartridge using same |
| CN102132475B (en) | 2008-06-30 | 2013-12-04 | 株式会社美姿把 | Electric motor |
| JP4613228B2 (en) * | 2008-06-30 | 2011-01-12 | シャープ株式会社 | Developing device and image forming apparatus |
| US8150292B2 (en) * | 2008-09-30 | 2012-04-03 | Kyocera Mita Corporation | Developing unit and image forming apparatus comprising same |
| JP5178435B2 (en) * | 2008-10-01 | 2013-04-10 | キヤノン株式会社 | Image forming apparatus |
| JP4748216B2 (en) * | 2008-12-15 | 2011-08-17 | 富士ゼロックス株式会社 | Developing device and image forming apparatus |
| DE102009047775B3 (en) * | 2009-09-30 | 2011-09-01 | Eastman Kodak Co. | Ventilation device and method for venting a housing and support fan |
| JP2011112990A (en) * | 2009-11-30 | 2011-06-09 | Konica Minolta Business Technologies Inc | Image forming apparatus |
| JP5742011B2 (en) * | 2011-03-18 | 2015-07-01 | 株式会社リコー | Image forming apparatus, image forming apparatus, and process cartridge |
| JP6102071B2 (en) * | 2012-03-27 | 2017-03-29 | 富士ゼロックス株式会社 | Blower structure and image forming apparatus |
| JP2014085556A (en) * | 2012-10-24 | 2014-05-12 | Fuji Xerox Co Ltd | Image forming apparatus and separation apparatus for collecting toner |
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| JP6686466B2 (en) * | 2016-01-21 | 2020-04-22 | 富士ゼロックス株式会社 | Developing device and image forming device |
| KR20190006726A (en) * | 2017-07-11 | 2019-01-21 | 에이치피프린팅코리아 유한회사 | developing device and electrophotographic image forming apparatus using the same |
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| CN112485992B (en) * | 2019-09-12 | 2022-12-30 | 柯尼卡美能达办公系统研发（无锡）有限公司 | Image forming apparatus with a toner supply device |
| JP7371424B2 (en) * | 2019-10-01 | 2023-10-31 | コニカミノルタ株式会社 | Developing device and image forming device |
| US11526127B2 (en) | 2020-04-22 | 2022-12-13 | Canon Kabushiki Kaisha | Developer container with airflow space |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5283615A (en) * | 1989-10-13 | 1994-02-01 | Minolta Camera Kabushiki Kaisha | Image forming apparatus having a plurality of developing devices |
| JPH103220A (en) | 1996-06-14 | 1998-01-06 | Ricoh Co Ltd | Developing device |
| JPH10274883A (en) | 1997-03-31 | 1998-10-13 | Toshiba Corp | Developing device |
| JP2000267440A (en) | 1999-03-12 | 2000-09-29 | Hitachi Koki Co Ltd | Developing machine |
| JP2004361869A (en) | 2003-06-09 | 2004-12-24 | Konica Minolta Business Technologies Inc | Image forming apparatus |
| US7845391B2 (en) * | 2004-01-15 | 2010-12-07 | Mitsubishi Heavy Industries, Ltd. | Air-conditioning unit and vehicle air-conditioning apparatus |
| JP4639667B2 (en) | 2004-07-07 | 2011-02-23 | コニカミノルタビジネステクノロジーズ株式会社 | Image forming apparatus |
-
2007
- 2007-01-12 JP JP2007003954A patent/JP4226039B2/en active Active
- 2007-12-14 US US11/956,382 patent/US7587154B2/en not_active Expired - Fee Related
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2008
- 2008-01-10 CN CN2008100030285A patent/CN101221395B/en not_active Expired - Fee Related
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|---|---|
| CN101221395A (en) | 2008-07-16 |
| JP2008170738A (en) | 2008-07-24 |
| US7587154B2 (en) | 2009-09-08 |
| US20080170876A1 (en) | 2008-07-17 |
| JP4226039B2 (en) | 2009-02-18 |
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